How?
3 seconds sound clip from the The Big Trail (1930) movie soundboard.
You can hear this line at 01:46:02 in the Blu-ray version of the movie.
Quote context
[...]
- But they can hear a shot at night.
- Well, they can't hear a knife.
- They all know this knife of mine.
- Well, here's a knife they don't know.
- No, no, no, no. I afraid of that knife. I know where you got it. It will get us in trouble sure.
- How?
- Because a dead man's knife is bad medicine!
- Here, just stop that drivel.
- Take the knife and wait for tonight.
- Wait until he's bedded down, and then...
[...]